@article{1183510490, author = {Alexander, J. W.}, title = {Gratings and homology theory}, journal = {Bull. Amer. Math. Soc.}, volume = {53}, number = {12}, year = {1947}, pages = { 201-233}, language = {en}, url = {http://dml.mathdoc.fr/item/1183510490} }
Alexander, J. W. Gratings and homology theory. Bull. Amer. Math. Soc., Tome 53 (1947) no. 12, pp. 201-233. http://gdmltest.u-ga.fr/item/1183510490/